Linux Tips

How to take the output of a command and pass it as arguments to another command ?

• using pips
  
• using xargs: $ ls /bin/b& | xargs -t dpkg-query -S

How to watch commads:

• $ watch -n 10 'ls -la'
• $ watch -d 'ls -la'

Using bash history:

• $ history
• $ ! 33
• $ ! !
• $ ! ls:s/CF/1

Bash: the shell
there are two types of files holding the bash settings, startup files and initialization files

• startup files: runs for any shell that is a login shell (/etc/profile/.bash_profile, .profile, and .bash_login)
• initialization files: runs for interactively running shells (not shell scripts) (/etc/bash.bashrc, ~/.bashrc)

sudo:

• every use of sudo gets logged in /var/log/secure